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Share-based compensation - Summary of share-based compensation expense and unrecognized costs (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
May 31, 2021 | Jun. 30, 2021 | Jun. 30, 2018 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
2014 Plan |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Increase in authorized shares | 8,601,471 | 12,601,471 |  |  |  |  |
Share-based compensation expense |  |  |  | $ 7,813 | $ 7,030 | $ 14,682 | $ 12,792
Unrecognized compensation costs |  |  |  | 65,859 |  | $ 65,859 |
Weighted-average remaining period for recognition (in years) |  |  |  |  |  | 2 years 5 months 19 days |
ESPP |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Share-based compensation expense |  |  |  | 6 | 9 | $ 12 | 17
2014 Plans and ESPP |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Share-based compensation expense |  |  |  | 7,813 | 7,030 | 14,682 | 12,792
Research and development expenses | 2014 Plans and ESPP |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Share-based compensation expense |  |  |  | 4,306 | 3,294 | 8,360 | 5,974
Selling, general and administrative expense | 2014 Plans and ESPP |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Share-based compensation expense |  |  |  | 3,359 | 3,737 | 6,174 | 6,818
Cost of manufacturing services revenues | 2014 Plans and ESPP |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Share-based compensation expense |  |  |  | 148 |  | 148 |
Share options | 2014 Plan |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Unrecognized compensation costs |  |  |  | 32,429 |  | $ 32,429 |
Weighted-average remaining period for recognition (in years) |  |  |  |  |  | 2 years 9 months 3 days |
Share options | 2014 Plans and ESPP |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Share-based compensation expense |  |  |  | 3,438 | 3,350 | $ 6,693 | 6,190
Restricted share units ("RSUs") | 2014 Plan |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Unrecognized compensation costs |  |  |  | 33,228 |  | $ 33,228 |
Weighted-average remaining period for recognition (in years) |  |  |  |  |  | 2 years 2 months 12 days |
Restricted share units ("RSUs") | 2014 Plans and ESPP |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Share-based compensation expense |  |  |  | 4,127 | 3,222 | $ 7,397 | 5,782
Performance Share Awards | 2014 Plan |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Unrecognized compensation costs |  |  |  | 202 |  | $ 202 |
Weighted-average remaining period for recognition (in years) |  |  |  |  |  | 2 months 15 days |
Performance Share Awards | 2014 Plans and ESPP |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Share-based compensation expense |  |  |  | $ 242 | $ 449 | $ 580 | $ 803
Employee Stock [Member] | ESPP |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Ordinary shares available for issue |  | 130,852 | 150,000 | 121,414 | 130,852 | 121,414 | 130,852
Discounted rate for purchase of shares |  |  | 85.00% |  |  |  |

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Discount rate from fair value on purchase date that participants pay for shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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